Cisco 7609 Configuration Manual page 403
Cisco ios software configuration guide—12.1e
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Chapter 32
Configuring PFC QoS
Table 32-1 IP Precedence and DSCP Values
3-bit IP
Precedence
0
1
2
3
1. MSb = most significant bit
78-14064-04
1
6 MSb
of ToS
6-bit
DSCP
8 7 6
5 4 3
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
2
0
0
0
0
1
1
3
0
0
0
1
0
0
4
0
0
0
1
0
1
5
0
0
0
1
1
0
6
0
0
0
1
1
1
7
0
0
1
0
0
0
8
0
0
1
0
0
1
9
0
0
1
0
1
0
10
0
0
1
0
1
1
11
0
0
1
1
0
0
12
0
0
1
1
0
1
13
0
0
1
1
1
0
14
0
0
1
1
1
1
15
0
1
0
0
0
0
16
0
1
0
0
0
1
17
0
1
0
0
1
0
18
0
1
0
0
1
1
19
0
1
0
1
0
0
20
0
1
0
1
0
1
21
0
1
0
1
1
0
22
0
1
0
1
1
1
23
0
1
1
0
0
0
24
0
1
1
0
0
1
25
0
1
1
0
1
0
26
0
1
1
0
1
1
27
0
1
1
1
0
0
28
0
1
1
1
0
1
29
0
1
1
1
1
0
30
0
1
1
1
1
1
31
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
1
3-bit IP
6 MSb
of ToS
Precedence
8 7 6
5 4 3
4
1
0
0
0
0
1
0
0
0
0
1
0
0
0
1
1
0
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
0
1
1
1
0
0
1
1
5
1
0
1
0
0
1
0
1
0
0
1
0
1
0
1
1
0
1
0
1
1
0
1
1
0
1
0
1
1
0
1
0
1
1
1
1
0
1
1
1
6
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
1
1
0
1
0
1
1
0
1
1
1
1
0
1
1
7
1
1
1
0
0
1
1
1
0
0
1
1
1
0
1
1
1
1
0
1
1
1
1
1
0
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
Understanding How PFC QoS Works
6-bit
DSCP
0
32
1
33
0
34
1
35
0
36
1
37
0
38
1
39
0
40
1
41
0
42
1
43
0
44
1
45
0
46
1
47
0
48
1
49
0
50
1
51
0
52
1
53
0
54
1
55
0
56
1
57
0
58
1
59
0
60
1
61
0
62
1
63
32-5
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